Filtering-cell.



PATBNTED AUG. 1, 1905.

G. A.4 1991909.19i K FILTBRING CELL.' APPLICATIONIILBD MAR. 1

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YUNITED STATES-,PATENT OFFICE.

I GUSTAVUS A. DUNCAN, DEADWOOI), SOUTH DAKOTA.`

i FILTERING-CELL.

erence being had to the accompanying drawings, forming a part thereof.

' The purpose of this invention is to provide an improved device particularly adapted for filtering slimes in ore treatment, and the improvements which constitute the invention relate to the construction ofthe cell, and consist of the features of construction of such cell, as set out in the `claims.

In the drawings, Figure 1 is a vertical longitudinal section of a filter embodying my improvements. Fig. 2 is a detail top plan view. Fig. 3 is a section at the line 3 3 on Fig. 1. Fig. 4 is a detail section at the line 4 4 on Fig. 1. A

` The tank-compartment A is supplied with the material to be filtered through pipes 1 1, which discharge material, preferably nearfthe bottom, with an upward trend. -Through the same pipes or through other pipes'2 2, ac-.

cording to circumstances, there may be supplied to the tank solvent liquor forfdissolving out the metal values from the slimes, and through either of the pipes v1 vor 2, according to circumstances, there may be supplied clear water for washing out the dissolved metal valuesand solventliquor to reduce the residuum. to clear sand for discharge as waste, such discharge being made through any suitable outlet provided in the bottom, which out'- let may be represented by the discharge-spout 3. For the purposeof flushing-out the tankcompartment either ofthe pipes 1 or 2 may have a branch 4 extending up in' the corner of the tankand then along the upper part of the latter, so that water may be discharged downwardly from it both' against the tankwall andthe cell-walls, if desired, at any time lfor completely cleaning said walls of any adhering residuum. v

The features above describedwith respect to the tank and the means of supplying material to and withdrawing it from the same are only incidental.

The central features of my invention reside in the cellwhich consists of a filtering-bag 4a of filtering material, such as canvas or the like, which is stretched upon and incloses a distending and peripheral frame or stretcher made of pipe 5. This pipe is Specification of Letters Patent.

Application filed March 1S, 1905. Serial No. 249,781.

latented Aug. 1, 1905.

suitably joined up with pipe-fittings to constitute a four-sided frame, consisting of top and bottom and opposite end bars, the top bar being connected to the end barsby T-fittings, into the outwardlyextending branches of which discharge and supply pipes 6 6 are connected, sleeves 7 7 being sewed on watertight to the bag at the apertures through which these pipes protrude and being adapted to be secured water-tight onto the pipes by exterior winding with cords or exible wire,- Vas villustrated at 8 8.

This frame may be stiffened at intervals throughout its length by 4pipe cross-bars 9 9, connected with the top and bottom bars by T-fittings in` the customaryxmanner of pipe-fitting. The pipe of which this frame is made is perforated at frequent intervals, both the top and bottom bars, end bars, and cross-bars being so perforated, so that proper pump connections being made to the pipe 6 6 liquid may be pumped from' or forced into the cell through the pipe-frame thereof.

At short intervals throughout the length of the cell there are located space-bars 10 10 10, which may be of wood, matched at their upper and lower ends tothe top and bottom bars of the frame so as to be held firmly in positionby the' latter, the matching consisting merely in suitably hollowing the ends of said space-bars to fit/,the pipe. These bars arein width equal to or greater than the diameter of the pipe which forms the frame and are designed to hold the canvas bag distended-that is, to prevent it from collapsing wall to wall upon suction being applied to draw the liquid through the canvas and ex- .haust'the cell in the filtering process.4 In

order to afford all parts of the cell free communication with each other, notwithstanding the absence o-f the space-bars, the latter have frequent grooves or notches 11 11 on their vedges facing toward the canvas, so that even when the latter is held sucked against the space-bars the communication is suficiently free between the compartments separated by the space-bars through these notches. The canvas bag extends some distance above the frame, the excess 12 at the upper side being designed to be rolled up on a roller 13 for closing the bag at the top, and such roller may be secured to the pipe 6 in any convenient way. The entire filter bag or cell is supported and suspended in the tank-compart-- ment by the pipe 6. Without specific illustration it may be understood that the pipe 6 at one end may be connected with a pump for exhausting the cell, while the other end vmay extend to an elevated tank for supplying the pressure, valves 15 15 in the pipe outside the cell at the two ends, respectively, serving to control the communication with either the pump or the tank at will.

This cell will be employed in the manner which has been fully set out in my pending application, Serial No. 223,971, which may be explained briefiy, as follows: The tankcompartment being supplied with the slimes to be treated, the e'ell being connected with the pump, the latter being operated to exhaust the cell, the liquid will be sucked in through the filtering canvas or bag of the cell, leaving the slime deposited on the outside of the latter, the liquor being conducted away for further treatment to recover the metal values which it may contain. Then by this process there has been deposited on the outside of the cell a layer of slimes as thick as is desired, a supply of metal-solvent liquor will be substituted for the supply of slime-bearing liquid, and the pumping being continued such solvent liquor will be sucked through the contents of the tank-compartment and through the deposited layer of slimes on the cell, such deposit being increased by the slimes still remaining in the contents of the tank, with the result that eventually substantially all the slimes contained in the tank will be thus deposited and that the solvent liquor being sucked through such deposited slimes will have dissolved therefrom substantially all other metal values. The supply of solvent liquor being now cut off and water being substituted and the pumping being continued, the slime deposit will be washed clear of all the metal-bearing liquor with which it was saturated during the pumping of such liquor, and this process may be continued until the liquor in the tank, being first diluted, will eventually be entirely substituted by clear water and the slime deposit on the cell will be washed clean of all metal-bearing liquor, and said deposit will thus become substantially clear sand or refuse dirt. When this stage in the process is reached, the supply of water through the pipes 2 or 3, as the case may be, being cut off, the connection of the pipes 6 6 will be shifted from the pump to the elevated tank or source of pressure and water being thus forced into the cell and out through the cell-wall will discharge the deposited slimes into the tank and the dischargespout being now open they will be flushed away, leaving the tank clean and empty or containing only clear water, whereupon the pressure being cutoff and the discharge-spout closed the tank may be recharged with slimes and the deposit repeated.

For binding the filtering web or bag to the interior construction in order that it may not be unduly distorted when distended by the pressure from within for dislodging the exterior coating of slimes I employ the saine means shown in my pending` application, Serial No. 223,971, said means consisting of exterior check-bars 18 18, connected together above and below the bag by slotted plates 19 19, which are secured and held in place by keys 2O 20. The slotted plates 19 at the upper side are applied above the roll of the canvas, which is wound up at the top to close the mouth of the bag, and these plates thus serve the purpose of securing the roll, preventingit from unrolling. The check-bars may be located in either of the two ways shown in iny said application, Serial No. 223,971-that is, either directly outside the spacing-bars, re-

spectively, or outside the intervals between those bars, being in the latter case preferably arranged in pairs, one at each side of a spacingbar.

In the above-described construction it will be noticed that the perforated pipe cross-bars 9 are adapted also to serve as spacing-bars, and they may be interposed with suiiicient frequency to perform that function suliiciently without additional means for that purpose, and in any event they serve by their distribution throughout the length of the cell to insure uniformityl in the operation of the suction at all parts of the length and height. These pipe cross-bars, as well as the end bars of the frame, are preferably connected into the longitudinal bars with right and left threads or provided with right and left threaded coupling, so that they may serve as means for drawing together the upper and lower side bars to cause the latter to grip firmly the ends of the space-bars distributed throughout the length of the cell. In any event, regardless of the employment of the right and left threaded connection for clamping, the pipe cross-bars are desirable in a cell of any considerable length to give rigidity to the upper and lower side bars and make the structure stiff enough to hold the space-bars, which obviously may be forced into position between the upper and lower side bars and retained tightly enough for most purposes, provided only that the said upper and lower bars do not lyield or spring too freely, and this is provented by sufficient number of the pipe crossbars.

I claim 1. In a filtering device, a filtering-cell comprising a frame or stretcher of perforated pipe and a filtering-Web inclosing such fralne or stretcher, the pipe-frame having connections extending fiuid-tight through the web for exterior communication with the pipe-cavity of the frame.

2. In a filtering device, a filtering-cell comprisinga frame or stretcher of perforated pipe; a filtering web inclosing such frame or stretcher, the pipe-frame having two connections extending fiuid-tight out through the web for exterior communication with the pipecavity, and exterior valves controlling said communications respectively.

3. In a filtering device, a filtering-cell comprising a frame or stretcher of perforated pipe;

" stretcher, the pipe-frame having connection extending fluid-tight through the web for exterior communication with the pipe-cavity, and spacing-bars distributed throughout the length of the cell extending from upper to lower side bar, having the'ends hollowed for seating endwise on the sides of the pipe-bars.

5.- In aviiltering device, a iltering-cell comprising aframe or stretcher of perforated pipe; a filtering web inclosing such frame or stretcher, the pipe-frame having connection extending fluid-,tight out through the web for exterior communication with the pipe-cavity;

a plurality of cross bars lor ties of perforated pipe connectingthe upper and lower side bars of the frame and communicating -therewith,`

and a plurality of space-bars extending from upper Vto lower side bar at intervals throughout the length of the cell and throughout the intervals between the pipe cross bars or ties,

such space-bars being held in position by having their ends hollowed for seating endwise on the side of the upper and lower side bars, the` pipe cross-bars having right and left thread connections for drawing together the side bars to cause them to bind on the end of the spacey' bars.

In testimony whereofy I have hereunto set my hand, in the presence of two witnesses, at Y Deadwood, South Dakota, thislst day of Oel tober, 1904. a

GUsTAvUs A. DUNCAN.

Witnesses:

J. B. EMPsoN, DONALD S. DUNCAN. 

